Secondary pressurizing and dehydrating method for sludge

A technology of secondary pressurization and sludge, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problem of high moisture content of sludge, reduce moisture content, improve dehydration efficiency, and reduce the burden of transportation and disposal. Effect

Active Publication Date: 2010-05-19
SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problem of high moisture content of dehydrated sludge, and to provide a sludge secondary pressure dehydration method suitable for treating excess sludge and concentrated sludge produced in sewage treatment plants , to further improve the sludge dewatering efficiency

Method used

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  • Secondary pressurizing and dehydrating method for sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The concentrated sludge with a water content of 95% is transported to the inorganic conditioning and tempering tank, and the ferric chloride solution with a concentration of 38.8% is first added to the sludge and fully stirred for 30 seconds. The dosage is 4.5% of the dry basis mass of the sludge; then add lime particles to the sludge and fully stir for 10 minutes, the calcium oxide content in the lime particles is 70%, and the dosage of lime particles is 12.5%.

[0023] The conditioned sludge to be pressed is transported to the plate and frame filter press through the screw pump, and the hydraulic station provides a compression pressure of 25MPa for the plate and frame filter press. The sludge particles are trapped in the filter chamber and gradually form a filter cake, and the filtrate is discharged through the filtrate collection system. When the pressure in the plate and frame filter press reaches 1.2 MPa, the pressurizing equipment stops feeding, and a filter cake...

Embodiment 2

[0026] Transport the concentrated sludge with a water content of 97% to the inorganic conditioning and tempering tank, first add ferric chloride solution with a concentration of 38.8% to the sludge and fully stir for 30 seconds. The dosage is 5% of the dry mass of the sludge; then add lime particles to the sludge and fully stir for 10 minutes, the calcium oxide content in the lime particles is 70%, and the dosage of lime particles is 15%.

[0027] The conditioned sludge is transported to the plate and frame filter press through a screw pump, and the hydraulic station provides a compression pressure of 25MPa for the plate and frame filter press. The sludge particles are trapped in the filter chamber and gradually form a filter cake, and the filtrate is discharged through the filtrate collection system. When the pressure in the plate and frame filter press reaches 1.0 MPa, the pressurizing equipment stops feeding, and a filter cake with a thickness of 30 mm is formed at this ti...

Embodiment 3

[0030] Transfer the remaining sludge with a moisture content of 99.3% to the inorganic conditioning and tempering tank, first add ferric chloride solution with a concentration of 38.8% to the sludge and fully stir for 30 seconds, the addition of ferric chloride solution The amount is 6.5% of the dry weight of the sludge; then add lime particles to the sludge and stir for 10 minutes. The calcium oxide content in the lime particles is 70%, and the dosage of lime particles is 20% of the dry weight of the sludge. %.

[0031] The conditioned sludge is transported to the plate and frame filter press through a screw pump, and the hydraulic station provides a compression pressure of 25MPa for the plate and frame filter press. The sludge particles are trapped in the filter chamber and gradually form a filter cake, and the filtrate is discharged through the filtrate collection system. When the pressure in the plate and frame filter press reaches 0.8 MPa, the pressurizing equipment stop...

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Abstract

The invention discloses a secondary pressurizing and dehydrating method for sludge. The method comprises the following steps: modifying the sludge before dehydrating; pressing and filtering internally pressed feeding materials; and secondarily pressurizing and pressing. The method has the advantages that: sewage sludge is modified by inorganic medicament before dehydrating to improve the incompressibility of sludge particles, the hydrophilic sludge particles are modified to hydrophobic sludge particles so as to contribute to subsequent pressing, filtering and dehydrating; the filter cakes are subjected to secondary pressurizing and pressing after the internally pressed feeding materials are pressed and filtered; and the water content of the sludge filter cakes are further reduced through high pressure pressing so as to improve the dehydrating efficiency and reduce subsequent transportation and treatment burden.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a sludge secondary pressure dehydration method for highly efficient mechanical dehydration of sewage sludge. Background technique [0002] Sewage sludge is the main waste of sewage treatment plants, and its treatment has become a major problem for sewage treatment plants. At present, the treatment process of sewage sludge is as follows: the remaining sludge is first concentrated in the gravity concentration tank to a water content of about 98-97%, and the concentrated sludge is mechanically dehydrated after being conditioned by cationic polyacrylamide solution, and the dehydrated sludge Sludge is transported and disposed of from the sewage treatment plant. Commonly used mechanical dehydration methods include centrifugal dehydration, belt dehydration, and plate and frame filter press dehydration. Centrifugal dehydration is to use centrifugal force to separate the water in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14
Inventor 钟环声吴学伟吴嘉聪孙志民杨海英
Owner SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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